Overriding iceTransportPolicy: 'relay' still triggers iOS Local Network Access prompt in React Native LiveKitRoom

[CoryDuan]

Describe the bug

When using LiveKitRoom in React Native and passing connectOptions={{ rtcConfig: { iceTransportPolicy: 'relay' } }}, the iOS app still prompts the user for Local Network Access. This happens even though relay-only should avoid usage of local (host) or reflexive candidates.

To Reproduce

1. Wrap LiveKitRoom with props including:

connectOptions={{
rtcConfig: { iceTransportPolicy: 'relay' }
}}

2. Launch TestFlight build on a real iOS device

3. Observe the “Would Like to Find and Connect to Devices on Your Local Network” prompt

4. reject the prompt and connection fails

Expected behavior

The prompt should not appear, because relay-only mode should avoid any local network candidate usage.

If the OS still requires the permission (because of internal probing), the SDK should provide a clear fallback or error message explaining why the prompt is needed.

[xianshijing-lk]

We are working on it.

From https://groups.google.com/g/discuss-webrtc/c/CwXK55Y2sb8/m/61yyeCXfCAAJ, WebRTC might enumerate the network interface under the hood, that might trigger such permission prompt on IOS 14.

As some technical context:
Starting with iOS 14, Apple introduced a system-level privacy permission:
“App Would Like to Find and Connect to Devices on Your Local Network”
This prompt is triggered any time your app attempts to:
Send multicast or broadcast traffic (like mDNS or SSDP)
Connect directly to a private IP (like 192.168.x.x or 10.x.x.x)
Probe the local network (e.g., via ICE candidates in WebRTC)

We are trying to verify it internally, please stay tuned.

[davidzhao]

@CoryDuan are you able to reproduce this with LiveKit Cloud? I don't believe it's an issue there

[CoryDuan]

@davidliu elevenlabs/packages#140 (comment)
This might help